Mouth keeps opening

I have attempted to WILD several times before, but every time I try to enter SP, after a while my mouth opens, and annoying drool comes out and soaks my face and pillow. I am just wondering if I should make an effort to keep my mouth closed or just let it go open (it does so naturally after a while)

Let it go open. Move your head to the side a little so that the drool would merely fall onto the bed instead of all over your face.